CVE-2026-53597
Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Prompty is a markdown file format (.prompty) for LLM prompts. From 2.0.0-alpha.1 until 2.0.0-beta.3, the @prompty/core TypeScript loader in runtime/typescript/packages/core/src/core/loader.ts used gray-matter without overriding executable js and javascript frontmatter engines, allowing an attacker-controlled .prompty file with ---js frontmatter to execute arbitrary JavaScript during prompt loading. This issue is fixed in version 2.0.0-beta.3.
| CWE | CWE-94 |
| Vendor | microsoft |
| Product | prompty |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Jul 16, 2026 |
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Affected Versions
microsoft / prompty
>= 2.0.0-alpha.1, < 2.0.0-beta.3